Differential Pair Design for 112 Gbps and Faster Systems
Presented at EOT 2023, Herning, DK (May 11, 2023)
Differential serial channels are pushing towards 56 GHz Nyquist to target 112G NRZ and 224G PAM-4 per lane. Differential interconnects targeting these bandwidths will be implemented in package substrates and in PCBs, although the fundamental design concepts present in both domains are essentially the same. While the core concepts apply in both domains, the challenges involved in package and PCB design are quite different. In PCBs, differential pairs designed to target these bandwidths must content with many challenges relating to via design, material selection, and differential crosstalk into slower channels. This presentation outlines these design challenges and how the fundamental approaches to differential pair design extend to 56 GHz bandwidths. Simulation examples from Simbeor and design examples from Altium Designer are presented to illustrate design implementation and approaches to working at 56 GHz.
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